patch 8.2.0624: Vim9: no check for space before #comment

Problem:    Vim9: no check for space before #comment.
Solution:   Add space checks.  Fix :throw with double quoted string.
diff --git a/src/userfunc.c b/src/userfunc.c
index dfda733..698c1b1 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -2373,7 +2373,7 @@
     /*
      * ":function" without argument: list functions.
      */
-    if (ends_excmd(*eap->arg))
+    if (ends_excmd2(eap->cmd, eap->arg))
     {
 	if (!eap->skip)
 	{
@@ -3711,7 +3711,7 @@
     if (!failed || eap->cstack->cs_trylevel > 0)
     {
 	// Check for trailing illegal characters and a following command.
-	if (!ends_excmd(*arg))
+	if (!ends_excmd2(eap->arg, arg))
 	{
 	    if (!failed)
 	    {